I haven't read the other posts yet but had to reply.
Do you want to stay and make things work?
Can you guys not talk about religion for the time and just love and respect each other? In the future could she ever accept you as the loving man that I assume you are even if you're not a witness? If you answer yes to those questions then try to make it work. Don't force your opinion on her. When she forces her be patient and quiet.